sendmail changes in OpenBSD 2.4

["Todd C. Miller" <Todd_(_dot_)_Miller_(_at_)_courtesan_(_dot_)_com>]

In 2.4, /usr/libexec/mail.local is no longer setuid, to prevent its
abuse by users (trivial mail forgery, filling up /var/mail, etc).

If you are upgrading from a previous version of OpenBSD you will
need to either regenerate your sendmail.cf with an OSTYPE of "openbsd"
instead of "bsd4.4" or edit the sendmail.cf directly and in the
line that begins with Mlocal, change the "rmn9" to "rmn9S".

If you use an old sendmail.cf with the 2.4 mail.local you will
lose mail.

 - todd